Pressure and Temperature Relief Valves

Protection against both excess temperature
as well as over-pressurisation

Product Description

The Seetru P3W Pressure & Temperature relief valve provides protection against both excess temperature as well as over pressurisation.  The valve will automatically discharge hot water at a predetermined set pressure and/or temperature.  Each of the lift mechanisms will work independently of each other. The valve is designed to be used in hot water boiler applications.


  • Size range: 1/2” (DN15) to 2 1/2” (DN65)
  • Set Pressure Range: 0.4 to 12.5 bar
  • Set Temperature: 90 – 95°C
  • BSP taper male inlet connections
  • BSP parallel outlet connections
  • WRAS-approved PTFE valve seal and silicone diaphragm
  • Sealed lever
  • WRAS Approved (all sizes and pressures) – certificate number 2011005
  • Designed in accordance with BS EN 1490 (Building valves. Combined temperature and pressure relief valves. Tests
    and requirements)
  • Valves supplied pre-set at the required set pressure and temperature
  • Test certificate supplied free of charge



View or Download Datasheet


Technical Information

Technical Information for Type P3W P&T Relief Valve

  • Min. Pressure
    0.40 bar (5.80 psi)
  • Max. Pressure
    12.50 bar (181.25 psi)
  • Temperature Range
    0°C to 200°C (subject to seal material)
  • Inlet Connection(s)
    1/2" BSPT to 2 1/2" BSPT
  • Outlet Connection(s)
    1/2" BSPT to 2 1/2" BSPT
  • Flow Rate
    Refer to Flow Tables on the datasheet
  • Materials
  • Seal Materials
  • Test Certification
    Included - supplied Free of charge
  • Approvals
    In accordance with BS EN 1490 WRAS


The above DN sizes are correctly related to the inlet & outlet connections mentioned. Please be aware other manufacturers may not correctly match the DN sizes listed to the connection sizes of their valves.

Thus, when comparing a Seetru P&T relief valve to a valve from a different manufacturer, please always compare the kW rating and threaded connection size, not the DN size.


Discharge Capacities
The discharge capacity of the relief valve must be equal to or greater than the output of the boiler it is intended to protect.
Below are the discharge capacities for both the temperature relief and the conventional pressure relief.
The temperature rating should be used to size and select the valve


View or Download the Type P3W Datasheet

Full Technical Information - Including Flow Rates

View or Download the Type P3W Datasheet

Seetru offers a wide range of downloadable datasheets for our products, including safety relief valves, liquid-level gauges, and sight glasses.  These datasheets provide detailed information on the technical specifications, features, and applications of Seetru products.  They are an essential resource for engineers, designers, and other professionals who need to select the right Seetru products for their specific needs.


Find your PDF Download for the p3W Range below…
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Visit Our Downloads Page View the Type P3W Datasheet

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